There are several plausible mechanisms potentially causing this increased carbon flux and we (with Gary Lovett) are investigating whether nitrogen deposition can cause greater DOC leaching from forest soils in the North East. Data from some N-fertilized plots shows greater DOC release while other sites show no effect. It seems likely that interactions with soil mineral layers or differences among sites in soil water flowpaths is contributing variability to results. Bioassays show that carbon released from some soils is metabolized by aquatic microbiota and supports rates of bacterial growth comparable to DOC from non-fertilized soils.